GrantPermissionRule

The GrantPermissionRule Rule allows granting of runtime permissions on Android M (API 23)
and above. Use this Rule when a test requires a runtime permission to do its work.

When applied to a test class this Rule attempts to grant all requested runtime permissions.
The requested permissions will then be granted on the device and will take immediate effect.
Permissions can only be requested on Android M (API 23) or above and will be ignored on all other
API levels. Once a permission is granted it will apply for all tests running in the current
Instrumentation. There is no way of revoking a permission after it was granted. Attempting to do
so will crash the Instrumentation process.

Note, this Rule is usually used to grant runtime permissions to avoid the permission dialog
from showing up and blocking the App's Ui. This is especially helpful for Ui-Testing to avoid
loosing control over the app under test.

The requested permissions will be granted for all test methods in the test class. Use grant(String) static factory method to request a variable number of permissions. Usage:
\@Rule
public GrantPermissionRule mRuntimePermissionRule = GrantPermissionRule
.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);